Boichuk О.A., Makarov, V.L. and Feruk, V.A. (2019) “A criterion of solvability of resonant equations and construction of their solutions”, Ukrains’kyi Matematychnyi Zhurnal, 71(10), pp. 1321–1330. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1517 (Accessed: 5 December 2025).